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LONG-TERM DEBT - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 21, 2018
USD ($)
Mar. 21, 2018
CAD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
EUR (€)
May 31, 2017
USD ($)
May 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Disclosure of detailed information about borrowings [line items]                  
Borrowings         $ 22,458,000,000       $ 16,805,000,000
Letters of credit and guarantees outstanding         866,000,000        
Financial guarantees outstanding         39,000,000        
Bank credit facilities                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         11,050,000,000        
Undrawn borrowing facilities         4,112,000,000        
Demand credit facility                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         100,000,000 € 15,000,000      
Non-revolving term credit facility maturing February 2019                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         750,000,000        
125 million non-revolving term credit facility maturing February 2019                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         125,000,000        
Non-revolving term credit facility maturing October 2019                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         2,200,000,000       $ 1,500,000,000
Borrowings         2,200,000,000        
Non-revolving term credit facility maturing May 2020                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         3,000,000,000        
Borrowings         $ 3,000,000,000        
Amortisation rate     5.00%   5.00% 5.00%      
Letter of credit                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility     $ 375,000,000            
Revolving syndicated credit facility maturing June 2020                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         $ 2,425,000,000        
Revolving syndicated credit facility                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         2,425,000,000        
Revolving syndicated credit facility maturing June 2019                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         330,000,000        
Undrawn borrowing facilities         330,000,000        
Revolving syndicated credit facility maturing June 2021                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility         $ 2,095,000,000        
Commercial paper (December 31, 2017 - US$500 million; December 31, 2016 - US$250 million)                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility     2,500,000,000            
Notional amount     $ 500,000,000 $ 250,000,000          
Credit facilities and commercial paper | Weighted average                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     2.20% 1.90% 2.20% 2.20%     1.90%
Long-term debt | Weighted average                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     3.80% 3.90% 3.80% 3.80%     3.90%
2.05% debentures due June 1, 2020                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     2.05%   2.05% 2.05%      
Notional amount         $ 900,000,000        
3.42% debentures due December 1, 2026                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     3.42%   3.42% 3.42%      
Notional amount         $ 600,000,000        
4.85% debentures due May 30, 2047                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     4.85%   4.85% 4.85%      
Notional amount         $ 300,000,000        
Medium-Term Borrowings Expiring August 2019 [Member]                  
Disclosure of detailed information about borrowings [line items]                  
Base shell prospectus borrowings         $ 3,000,000,000        
3.31% debentures due February 11, 2022                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     3.31%   3.31% 3.31%      
Notional amount         $ 1,000,000,000        
5.70% due May 15, 2017 (US$1,100 million)                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     5.70%   5.70% 5.70%      
Notional amount     $ 1,100,000,000            
Repayment of borrowings     $ 1,100,000,000            
2.95% due January 15, 2023 (US$1,000 million)                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     2.95%   2.95% 2.95%      
Notional amount     $ 1,000,000,000            
3.85% due June 1, 2027 (US$1,250 million)                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     3.85%   3.85% 3.85%      
Notional amount     $ 1,250,000,000            
4.95% due June 1, 2047 (US$750 million)                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     4.95%   4.95% 4.95%      
Notional amount     $ 750,000,000            
US dollar denominated debt, unsecured                  
Disclosure of detailed information about borrowings [line items]                  
Base shell prospectus borrowings     $ 3,000,000,000            
Three-month LIBOR plus 0.375%                  
Disclosure of detailed information about borrowings [line items]                  
Repayment of borrowings       $ 500,000,000          
Three-month LIBOR plus 0.375% | LIBOR                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate       0.375%         0.375%
6% Notes                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate       6.00%         6.00%
Repayment of borrowings       $ 250,000,000          
1.75% due January 15, 2018 (US$600 million)                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     1.75%   1.75% 1.75%      
Notional amount     $ 600,000,000            
5.90% due February 1, 2018 (US$400 million)                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     5.90%   5.90% 5.90%      
Notional amount     $ 400,000,000            
North Sea                  
Disclosure of detailed information about borrowings [line items]                  
Letters of credit outstanding         $ 63,000,000        
AOSP                  
Disclosure of detailed information about borrowings [line items]                  
Letters of credit outstanding         $ 651,000,000        
AOSP | Non-revolving term credit facility maturing May 2020                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility               $ 3,000,000,000  
AOSP | Long-term debt                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings             $ 3,000,000,000    
AOSP | Medium-term notes                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings               $ 1,800,000,000  
Major debt transactions | 125 million non-revolving term credit facility maturing February 2019                  
Disclosure of detailed information about borrowings [line items]                  
Repayment of borrowings   $ 125,000,000              
Major debt transactions | Non-revolving term credit facility maturing February 2021                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility   750,000,000              
Major debt transactions | Non-revolving term credit facility maturing May 2020                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings   2,850,000,000              
Repayment of borrowings   $ 150,000,000              
Major debt transactions | 1.75% due January 15, 2018 (US$600 million)                  
Disclosure of detailed information about borrowings [line items]                  
Repayment of borrowings $ 600,000,000                
Major debt transactions | 5.90% due February 1, 2018 (US$400 million)                  
Disclosure of detailed information about borrowings [line items]                  
Repayment of borrowings $ 400,000,000